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Related Concept Videos

Bones of the Lower Limb: Femur and Patella01:16

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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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Updated: Mar 7, 2026

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Offset acetabular cups: A solution to wear?

T T Ioannidis1, N D Gkantaifis, G S Themistocleous

  • 15th Orthopaedic Clinic, "KAT" Accident Hospital, University of Athens, School of Medicine, "KAT" Acc.

Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
|February 23, 2017
PubMed
Summary
This summary is machine-generated.

Offset acetabular cups significantly reduce hip joint reaction forces by 28.8% and the angle of force application by 2.8 degrees. This finding supports the broader use of offset cups to enhance total hip arthroplasty longevity.

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Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Biomaterials Science

Background:

  • Improving total hip arthroplasty (THA) longevity primarily focuses on tribological properties, with less attention given to reducing joint forces.
  • Recent studies highlight positive clinical outcomes and wear behavior associated with offset low friction arthroplasty cups.

Purpose of the Study:

  • To estimate the resultant hip joint reaction force and its angle of application.
  • To compare forces between conventional concentric and offset eccentric acetabular cups in THA.

Main Methods:

  • Utilized a simplified free body technique for force estimation.
  • Analyzed 100 individual anteroposterior pelvic radiographs.
  • Templated both conventional concentric and offset eccentric cups on the same hip anatomy.

Main Results:

  • A highly significant reduction (p<0.0001) in the resultant hip joint reaction force was observed with offset cups (28.8% or 1.02 body weight).
  • The angle of hip joint reaction force was significantly reduced by 2.8 degrees in the offset cup group.
  • The observed force reduction is attributed to the medialization and lowering of the hip's center of rotation.

Conclusions:

  • Offset acetabular cups demonstrably reduce hip joint reaction forces and their application angle.
  • The findings suggest potential for increased longevity in total hip arthroplasty.
  • Generalized use of offset acetabular cups is proposed due to anticipated lack of adverse events.